基于边缘增强的深度图超分辨率重建  

Super-resolution reconstruction for depth map based on edge enhancement

作　　者：严徐乐 安平[1] 郑帅[1] 左一帆[1] 沈礼权[1] 

机构地区：[1]上海大学通信与信息工程学院,新型显示技术及应用集成教育部重点实验室,上海200072 [2]Advanced Analytics Institute, University of Technology, Sydney, Australia

出　　处：《光电子．激光》2016年第4期437-447,共11页Journal of Optoelectronics·Laser

基　　金：国家自然科学(U1301257,61571285,61172096,61422111)基金项目

摘　　要：准确的深度图像获取是计算机视觉中的一个难题。传统的立体匹配得到深度的方法不仅计算量大,而且在纹理稀疏与重复区域往往存在较大的误差。主动式深度传感器虽然解决了这些问题,但其获取的深度图存在着分辨率低和易受噪声干扰的问题。因此,本文提出一种结合彩色图像信息的深度图超分辨率(SR)重建方法来提高深度图的质量与分辨率。首先运用自回归(AR)模型下的非局部均值(NLM)算法获取初始的上采样深度图;然后利用边缘提取与边缘修复算法优化深度图。实验结果表明,本文提出的方法能够生成误差更小、主观质量更好的高分辨率深度图。Capturing accurate depth map is a tough task in computer vision.Traditional method of stereo matching not only has a large computational cost,but also has a bad performance in areas with sparse or repeated texture.Although active range sensor can solve these problems,the depth maps captured by the range sensors have low resolution and are susceptible to noise.In this paper,a super-resolution reconstruction method based on the edge enhancement algorithm is presented to improve the quality and resolution of the depth map.Firstly,nonlocal means（NLM）algorithm is applied in the autoregressive（AR）model to generate an up-sampled depth map.Afterward,accurate edge detection and edge rectification algorithms are used to optimize the up-sampled depth map.The experimental results indicate that the proposed approach,in general,is capable of generating the high-resolution depth maps with smaller error and better subjective quality in comparison with the art-of-state algorithms.

关 键 词：超分辨率(SR) 上采样 边缘增强 深度图 

分 类 号：TN919.8[电子电信—通信与信息系统]